Fixed IsSweepingComplete and EnsureSweeperProgress helper functions.

src/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 544 matching lines @@
     bool success = marking_deque_memory_->Uncommit(
         reinterpret_cast<Address>(marking_deque_memory_->address()),
         marking_deque_memory_->size());
     CHECK(success);
     marking_deque_memory_committed_ = false;
   }
 }
 
 
 void IncrementalMarking::Start() {
+  ASSERT(!heap_->mark_compact_collector()->IsConcurrentSweepingInProgress());
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Start\n");
   }
   ASSERT(FLAG_incremental_marking);
   ASSERT(state_ == STOPPED);
 
   ResetStepCounters();
 
-  if (heap_->old_pointer_space()->IsSweepingComplete() &&
-      heap_->old_data_space()->IsSweepingComplete()) {
+  if (heap_->IsSweepingComplete()) {
     StartMarking(ALLOW_COMPACTION);
   } else {
     if (FLAG_trace_incremental_marking) {
       PrintF("[IncrementalMarking] Start sweeping.\n");
     }
     state_ = SWEEPING;
   }
 
   heap_->new_space()->LowerInlineAllocationLimit(kAllocatedThreshold);
 }
@@ skipping 418 matching lines @@
   bytes_scanned_ = 0;
   write_barriers_invoked_since_last_step_ = 0;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects();
 }
 
 } }  // namespace v8::internal